docs: def do_local(self, host="localhost", port=8000):
          """
          Connect to a local DynamoDB instance. Use 'local off' to disable.
  
          > local
          > local host=localhost port=8001
          > local off
  
          """
          port = int(port)
          if host == "off":
              self._local_endpoint = None
          else:
              self._local_endpoint = (host, port)
          self.onecmd("use %s" % self.engine.region)